Creating a blob column

Blob data type represents a constant hexadecimal number.

A blob (Binary Large OBject) data type represents a constant hexadecimal number defined as
0[xX](hex)+ where hex is a hexadecimal character, such as
[0-9a-fA-F]. For example, 0xcafe. The maximum
theoretical size for a blob is 2 GB. The practical limit on blob size, however, is less than
1 MB. A blob type is suitable for storing a small image or short string.

Blob conversion functions

These functions convert a native type into binary data (blob), and convert a blob back into
a native type:

typeAsBlob(value)

blobAsType(value)

For every native non-blob data type supported by CQL, the typeAsBlob()
function takes an argument of that data type and returns it as a blob.

Conversely, the blobAsType() function takes a 64-bit blob argument and
converts it to a value of the specified data type, if possible.